Apr 23
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GStack is an open-source toolkit built by YC President & CEO Garry Tan that turns Claude Code into an AI engineering team — with skills for office hours, design, code review, QA, and browser testing. https://github.com/garrytan/gstack In this video, Garry walks through how GStack works, starting with Office Hours, a skill modeled after real YC partner sessions that pressure-tests your idea before you write a line of code. He demos it live, going from idea through adversarial review, design mockups, and automated QA in a single session. 00:00 – AI Just Changed Coding Forever 00:09 – From YC to Building With AI 01:07 – Why AI Coding Feels So Different 02:45 – Turning AI Into a Real Team (GStack) 03:45 – Let’s Build an App Live 05:23 – The Question That Kills Most Ideas 07:13 – This Idea Just Got Way Bigger 08:38 – The “Feels Illegal” AI Hack 10:50 – Upgrading the Idea in Real Time 12:44 – Breaking + Fixing the Plan 14:25 – AI Designs the App 16:59 – The Full System Explained 18:00 – Running Multiple AI Engineers 20:00 – Shipping 10x Faster 21:20 – The Only Thing That Matters Now Apply to Y Combinator: https://www.ycombinator.com/apply Work at a startup: https://www.ycombinator.com/jobs https://www.conductor.build/